Leaked Russian Records Disclose 400,000 Military Fatalities in Ukraine War

Confidential death certificates extracted from Russia's state statistics agency reveal that nearly 400,000 Russian military fatalities have been explicitly linked to the war in Ukraine. The internal records, obtained during a massive cyberattack on Rosstat, transition the conflict's death toll from external intelligence estimates to documented domestic data.[1][2]

Between October 29 and November 1, the Belarusian pro-opposition group Cyber Partisans and the Ukrainian hacker collective Silent Crow breached Rosstat's internal networks. The groups exfiltrated approximately 23 terabytes of data, including over 11 million death certificates registered between early 2021 and late August 2026.[1][4][5]

The leaked database provides the first comprehensive look at the human cost of the invasion from inside the Russian state apparatus. Russia's Defense Ministry has not officially disclosed its battlefield losses since September 2022, consistently dismissing independent and Western casualty estimates as unreliable propaganda.[4]

"This is the most significant leak of data when it comes to Russian casualties," Janis Kluge, head of the Russia and Eurasia division at the German Institute for International and Security Affairs, told The Moscow Times. Kluge noted that the figures establish the current phase of the war as exceptionally deadly.[4]

Rosstat acknowledged that its IT infrastructure faced targeted cyberattacks during the specified window, which temporarily took portions of its services offline. However, the federal agency denied that any confidential databases had been compromised or that sensitive demographic information was leaked to unauthorized parties.[1][2]

Methodologies and casualty counts

The two hacking groups applied different methodologies to the 11 million death certificates to calculate the war's toll. Cyber Partisans identified 393,881 deaths explicitly attributed to military operations, relying on specific International Classification of Diseases codes and free-text entries mentioning terms like "shelling" or "drones."[1][2][5]

Silent Crow published a broader estimate of 450,100 fatalities by including non-combat deaths among military personnel. Their dataset captured 14,160 soldiers who died from illnesses, road accidents, or suicide, alongside 13,671 individuals registered in Russia but reported dead in occupied Ukrainian territories without a specified cause.[2][4][5]

The leaked records indicate that the war in Ukraine has become the fourth most common cause of death in Russia since 2022. The figures make the current invasion Russia's deadliest conflict since World War II, vastly exceeding the 13,000 Soviet troops killed during the nine-year Soviet-Afghan War.[4]

Independent media outlets and data journalists have cross-referenced samples of the leaked database with existing open-source casualty lists. According to Bloomberg, the overall mortality figures in the leak closely match Rosstat's previously published official statistics for 2021 and 2022, showing discrepancies of just 0.1 to 0.2 percent.[1]

The data also highlights where the heaviest fighting occurred, with 72 percent of the war-related deaths registered in the occupied Donetsk region. Within that territory, over 20,000 Russian troops were killed during the grueling 10-month battle for the city of Bakhmut alone.[4]

Demographic shifts and regional disparities

The death certificates reveal a stark shift in the demographics of the Russian military as the conflict has dragged on. During the opening months of the invasion in 2022, war-related causes accounted for less than 1 percent of deaths among Russian men aged 50 to 59.[1]

By the first half of 2025, that figure had surged, with combat fatalities responsible for more than 16 percent of all deaths in that older age bracket. The data suggests that as initial invasion forces were depleted, the Russian military increasingly relied on older recruits and mobilized reservists to maintain frontline troop levels.[1]

Regional inequalities are deeply embedded in the casualty figures, with poorer areas bearing a disproportionate share of the losses. In several Siberian regions, roughly a third of all deaths among men aged 18 to 49 were linked to the war through mid-2024.[1]

In contrast, residents of Russia's wealthiest and most politically sensitive cities have remained largely insulated from the highest casualty rates. In Moscow and St. Petersburg, war-related fatalities accounted for only about one in ten deaths among men in the same 18 to 49 demographic.[1]

The financial and demographic strain of replacing these losses is compounding pressure on Russia's workforce and public finances. Investors and economic analysts are monitoring the depletion of working-age men, which exacerbates existing labor shortages across the Russian domestic economy.[1]

Aligning with independent tracking

Before the Rosstat leak, the most reliable public casualty counts came from independent Russian media outlets Mediazona and BBC Russian. Relying on obituaries, cemetery visits, and probate registry data, their joint project had confirmed the names of 285,881 dead Russian soldiers by early November 2026.[1][5]

The journalists running the open-source project have consistently stated that their verified name count captures only a fraction of the actual death toll. The newly leaked state records validate those assumptions, placing the true number of fatalities roughly 100,000 to 150,000 higher than the publicly confirmed list.[5]

The leaked figures also align with recent assessments from Ukrainian and Western intelligence agencies regarding the war's accelerating attrition rate. European intelligence reports cited by Bloomberg indicate that October 2026 saw a record 54,000 Russian troops either killed or seriously wounded.[1]

The territorial cost of the Russian advance is thrown into sharp relief when the fatality numbers are compared to battlefield gains. Based on data from the Ukrainian mapping project DeepState, Russia has captured approximately 73,000 square kilometers of Ukrainian territory since February 2022.[2]

Using Silent Crow's upper estimate of 450,100 war-related deaths, the Russian military has sacrificed roughly six soldiers for every square kilometer of territory seized. That ratio has worsened over time as the front lines hardened and Russian forces relied on mass infantry assaults to break Ukrainian defenses.[2][5]

Missing data and future implications

Despite the unprecedented scale of the Rosstat leak, the 400,000 figure likely understates the total human cost of the Russian campaign. The Demography database only records confirmed deaths where a certificate has been issued, leaving significant gaps in the overall casualty picture.[1][4]

Soldiers who are missing in action or whose remains have not been recovered from the battlefield are excluded from the leaked statistics. Additionally, the database does not appear to capture the estimated 27,000 foreign fighters recruited into the Russian armed forces, as their deaths are rarely registered in the domestic civil system.[4]

Registration delays further complicate the accuracy of the most recent figures, meaning the death toll from the intense fighting in late summer and autumn of 2026 is likely incomplete. Thousands of fatalities from recent offensives may not enter the Rosstat system for several months.[1]

The exposure of the internal data presents a significant political challenge for the Kremlin, which has carefully managed domestic perceptions of the war's cost. The sheer volume of death certificates contradicts state media narratives that portray the "special military operation" as a controlled and low-casualty endeavor.[1][4]

As the conflict approaches its fifth year, the verified loss of over 400,000 men will force Russian military planners to confront the sustainability of their current strategy. The necessity of replacing such massive losses raises the prospect of further unpopular mobilization drives to maintain combat operations in Ukraine.[1]

The data leak also provides international policymakers with concrete metrics to evaluate the effectiveness of Western sanctions and military support for Kyiv. Understanding the true extent of Russian losses allows allied nations to better gauge Moscow's long-term capacity to sustain high-intensity warfare on the European continent.[1][3]